this is what I have done: 1) I have checked all heater doors and the are working fine. 2) I have replaced the thermostat 3 times and have checked each one before replacing them. 3) the coolent level has not gone down and is full. 4) I have checked the heater core hoses and both are hot to the touch. 5) I have used a thermometer to check the temperature of the heater core and have gotten a reading of approximately 170- 190 degrees. 6) I have even cut a small door in the heater core housing and verified that the entire core is at the temperatures stated before.
the truck does not overheat so I know the water pump is working.
what could be the problem please help.
have the same problem?
Wednesday, December 1st, 2010 AT 1:40 PM